As Mickey leaves for a big score in Australia, Danny steps up to the mark as the gangs new leader, but can he convince a greedy American businessman to buy the Hollywood Hills sign?

BBC的关于大都会警察局“悬疑旧案”部门的喜剧。小组的头是女DS桑德拉普尔曼，既然是和旧事有关，索性就招聘了3个退休侦探：杰克把死去的爱妻埋在后院每天和她聊天，盖里年轻时有名的花心如今要和三个前妻四个女儿共进晚餐，布莱恩是个强迫症、前酒徒和阴谋论者。标题取自一句老话：“You can't teach meijubar.net an old dog new tricks（老家伙学不来新窍门）”。这帮老家伙却成功地在新时代用他们的经验和技，那些疑难案件正中了看似过时的老窍门的道。

米奇前往澳大利亚大展宏图，丹尼成为帮派新领导人，但他能说服贪婪的美国商人购买好莱坞山的标志吗？

　　The pathologists investigate when a military helicopter crashes into a refugee detention center. Harry and Nikki actually witnessed the crash and were first on the scene but the case is complex since the center was Ministry of Defense property leased to the Home Office. The team is shocked at the conditions they find in the center and Harry, who has a close friend in the RAF, is shaken when a government Minister attributes the accident to pilot error.

第一季末尾，Sam见到了33年前的父亲，企图通过挽留父亲让一切恢复正常，但结果却让他大失所望。第二季Sam将继续寻找真相，本季结尾也将为Sam的时光之旅作出一个交代，他究竟是昏迷，发疯，还是真的回到了过去？而他与女警Annie Cartwright的感情又将何去何从？